iTextSharp.text.pdf.PdfPKCS7.FindOcsp C# (CSharp) Метод

        private void FindOcsp(Asn1Sequence seq) {
            basicResp = null;
            bool ret = false;
            while (true) {
                if ((seq[0] is DerObjectIdentifier) 
                    && ((DerObjectIdentifier)seq[0]).Id.Equals(OcspObjectIdentifiers.PkixOcspBasic.Id)) {
                    break;
                }
                ret = true;
                for (int k = 0; k < seq.Count; ++k) {
                    if (seq[k] is Asn1Sequence) {
                        seq = (Asn1Sequence)seq[0];
                        ret = false;
                        break;
                    }
                    if (seq[k] is Asn1TaggedObject) {
                        Asn1TaggedObject tag = (Asn1TaggedObject)seq[k];
                        if (tag.GetObject() is Asn1Sequence) {
                            seq = (Asn1Sequence)tag.GetObject();
                            ret = false;
                            break;
                        }
                        else
                            return;
                    }
                }
                if (ret)
                    return;
            }
            DerOctetString os = (DerOctetString)seq[1];
            Asn1InputStream inp = new Asn1InputStream(os.GetOctets());
            BasicOcspResponse resp = BasicOcspResponse.GetInstance(inp.ReadObject());
            basicResp = new BasicOcspResp(resp);
        }